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A Genome-Wide Association Study Identifies Two Novel Susceptible Regions for Squamous Cell Carcinoma of the Head and Neck

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A Genome-Wide Association Study Identifies Two Novel Susceptible Regions for Squamous Cell Carcinoma of the Head and Neck Author Manuscript Published OnlineFirst on April 10, 2020; DOI: 10.1158/0008-5472.CAN-19-2360 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. 1 A genome-wide association study identifies two novel susceptible regions for squamous cell carcinoma of the head and neck Sanjay Shete1,2**, Hongliang Liu3,4,*, Jian Wang2*, Robert Yu2*, Erich M. Sturgis5, Guojun Li5, Kristina R. Dahlstrom5, Zhensheng Liu3,4, Christopher I. Amos6, Qingyi Wei3,7** 1Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. 2Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA 3Duke Cancer Institute, Duke University Medical Center, Durham, NC, USA. 4Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA. 5Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. 6The Institute for Clinical and Translational Research, Baylor College of Medicine, Houston, 77030, TX, USA. 7Department of Population Health Sciences, Duke University Medical School, Durham, NC, USA. Conflict of Interest: The authors declare no potential conflicts of interest. *These authors contribute equally **Address for correspondence and reprints: Sanjay Shete, Department of Epidemiology, The University of Texas MD Anderson Cancer Center, 1400 Pressler Dr, FCT4.6002, Houston, TX 77030, USA, Phone: (713) 745-2483; Fax: (713) 563-4243; Email: [email protected] Downloaded from cancerres.aacrjournals.org on September 26, 2021. © 2020 American Association for Cancer Research. Author Manuscript Published OnlineFirst on April 10, 2020; DOI: 10.1158/0008-5472.CAN-19-2360 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. 2 and Qingyi Wei, Department of Population Health Sciences, Duke University School of Medicine, Durham, NC. Durham, NC 77030, USA, Phone: (919) 660-0562; FAX: (919) 660- 0178; Email: [email protected] Running Title: Two novel regions associated with SCCHN risk Keywords: Head and neck cancer, Case-control, Genome-wide association study, Genetic susceptibility, Single-nucleotide polymorphism Downloaded from cancerres.aacrjournals.org on September 26, 2021. © 2020 American Association for Cancer Research. Author Manuscript Published OnlineFirst on April 10, 2020; DOI: 10.1158/0008-5472.CAN-19-2360 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. 3 Abstract To identify genetic variants for risk of squamous cell carcinoma of the head and neck (SCCHN), we conducted a two-phase genome-wide association study consisting of 7,858,089 SNPs in 2,171 cases and 4,493 controls of non-Hispanic white, of which 434,839 typed and 7,423,250 imputed SNPs as the discovery. SNPs with P <1×10-3 were further validated in the OncoArray study of oral and pharynx cancer (5,205 cases and 3,232 controls of European ancestry) from dbGaP. Meta-analysis of the discovery and replication studies identified one novel locus 6p22.1 (P = 2.96×10-9 for the leading rs259919) and two cancer susceptibility loci 6p21.32 (rs3135001, HLA-DQB1) and 6p21.33 (rs1265081, CCHCR1) associated with SCCHN risk. Further stratification by tumor site revealed four known cancer loci (5p15.33, 6p21.32, 6p21.33, and 2p23.1) associated with oral cavity cancer risk and oropharyngeal cancer risk, respectively. In addition, one novel locus 18q22.2 (P = 2.54×10-9 for the leading SNP rs142021700) was identified for hypo-pharynx and larynx cancer risk. For SNPs in those reported or novel loci, we also performed functional annotations by bioinformatics prediction and eQTL analysis. Collectively, our identification of four reported loci (2p23.1, 5p15.33, 6p21.32, and 6p21.33) and two novel loci (6p22.1 and 18q22.2) for SCCHN risk highlight the importance of HLA loci for oropharyngeal cancer risk, suggesting that immunologic mechanisms are implicated in the etiology of this subset of SCCHN. Significance: Two novel risk loci for SCCHN in non-Hispanic white individuals highlight the importance of immunologic mechanism in the disease etiology. Downloaded from cancerres.aacrjournals.org on September 26, 2021. © 2020 American Association for Cancer Research. Author Manuscript Published OnlineFirst on April 10, 2020; DOI: 10.1158/0008-5472.CAN-19-2360 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. 4 Introduction Squamous cell carcinoma of the head and neck (SCCHN) is the sixth most common malignancy world-wide and seventh leading cause of cancer-related deaths worldwide (1,2). In the United States, it is estimated that there will be approximately be 65,410 new cases and 14,620 deaths to occur in 2019 (3). SCCHN includes cancers of the oral cavity (including the gums and tongue), pharynx and larynx with well-documented associations with exposure to tobacco and alcohol as well as infection with human papillomavirus (HPV) (4-6). However, the disease develops in only a small fraction of tobacco users, alcohol drinkers or individuals who contracted HPV (7), implying an important role of genetic susceptibility in the etiology of SCCHN (8,9). For example, genetic variants in alcohol-related genes (i.e., ADH1B and ADH7) have been reported to be associated with the risk of SCCHN and upper aerodigestive cancers (10,11). To date, there is only two published genome-wide association studies (GWASs) of SCCHN (12,13). One study was performed with 2,398 cases and 2,804 controls with Chinese ancestry and reported six loci (i.e., 5q14.3, 6p21.33, 6q16.1, 11q12.2, 12q24.21 and16p13.2) associated with the laryngeal cancer risk (12). Another study investigated the genetic susceptibility of oral cavity and pharyngeal cancer with 6,034 cases and 6,585 controls of European ancestry, which reported three loci (i.e., 6p21.32, 10q26.13 and 11p15.4) associated with the overall cancer risk, four loci (i.e., 2p23.3, 5p15.33, 9p15.3 and 9q34.12) contribute to oral cancer, and the human leukocyte antigen (HLA) region 6p21.32 associated with oropharyngeal cancer (13). These limited risk loci represent only a small proportion of heritability, and no additional follow-up studies have been reported. In the present GWAS, with the goal of identifying additional novel genetic risk loci for SCCHN, we conducted a two-phase GWA study in non-Hispanic whites. We first identified SNPs in the MDACC GWAS, followed by validating those SNPs with P < 1 × 10-3 using the published OncoArray GWAS data. As a result, we found three loci (6p22.1, 6p21.33 and Downloaded from cancerres.aacrjournals.org on September 26, 2021. © 2020 American Association for Cancer Research. Author Manuscript Published OnlineFirst on April 10, 2020; DOI: 10.1158/0008-5472.CAN-19-2360 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. 5 6p21.32) for overall SCCHN risk, three for oropharyngeal cancer risk (2p23.1, 6p21.33 and 6p21.32), two for oral cavity cancer risk (5p15.33 and 6p21.32), and one (18q22.2) for the hypo- pharyngeal and laryngeal cancer risk. Therefore, we identified two novel loci (6p22.1 and 18q22.2) for SCCHN risk in addition the replication of four known cancer susceptibility regions (2p23.1, 5p15.33, 6p21.33 and 6p21.32). Material and Methods Populations and genotyping Discovery population: The SCCHN cases of the present GWAS were ascertained at Head and Neck Surgery Clinic through The University of Texas MD Anderson Cancer Center, Texas (MDACC) (14,15) between December 1996 and July 2011, whose genomic DNA was genotyped with Illumina HumanOmniExpress-12v1 BeadChip. All cases were individuals with newly diagnosed, histologically confirmed, previously untreated SCCHN of the oral cavity, pharynx or larynx (14-16). Cases were categorized by tumor site according to the International Classification of Diseases for Oncology (ICD-O, 2nd ed.) or ICD10 (5,17-19). We considered individuals with cancers of the oral cavity (codes C00.3–C00.9, C02.0–C02.3, C03.0, C03.1, C03.9, C04.0, C04.1, C04.8, C04.9, C05.0, C06.0–C06.2, C06.8, and C06.9), oropharynx (codes C01.9, C02.4, C05.1, C05.2, C09.0, C09.1, C09.8, C09.9, C10.0–C10.4, C10.8, and C10.9), hypopharynx (codes C12.9, C13.0–C13.2, C13.8, and C13.9), oral cavity or pharynx overlapping or not otherwise specified (codes C02.8, C02.9, C05.8, C05.9, C14.0, C14.2, and C14.8), larynx (codes C32.0–C32.3 and C32.8–C32.9). After quality control process, genotypes were available for 2,221 cases (Supplementary Figure. 1). The controls were recruited from genetically unrelated visitors who accompanied cancer patients to MDACC outpatient clinics (14,15,20), or individuals recruited previously for the MDACC melanoma study (20), which was deposited in database of Genotypes and Phenotypes Downloaded from cancerres.aacrjournals.org on September 26, 2021. © 2020 American Association for Cancer Research. Author Manuscript Published OnlineFirst on April 10, 2020; DOI: 10.1158/0008-5472.CAN-19-2360 Author manuscripts have been peer reviewed and accepted for publication but have not yet been edited. 6 (dbGaP accession#: phs000187.v1.p1) or from Study of Addiction: Genetics and Environment (SAGE) study (SAGE; dbGaP accession #: phs000092.v1.p1) (21). Of these datasets, there were 1,188 cancer-free individuals recruited for the SCCHN study, whose genomic DNA was genotyped by using Illumina HumanOmniExpress-12v1 BeadChip; 1,026 cancer-free individuals previously recruited for the melanoma GWA study, in which the genomic DNA was genotyped by using Illumina Omni1-Quad_v1-0_B BeadChip, and 2,377 cancer-free individuals of European descendent from the SAGE study(21), who have genotyping data generated by Illumina Human1Mv1 BeadChip.
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